Hydrosulfite preparation.



o nrrnn s'ri ns PATENT @FFIQE.

RUDOLF MULLER, OF HOGHST-ON-TIHE-MAIN, GERivIANY, ASSIGNOR To FARBWERKE VORM. MEISTER LUGIUS & BRUNING. or HocHs'r-o -THE- MAIN, GERMANY, A CORPORATION OFLGERMANY.

HYDROSULFITE PREPABATEONJ Specification of Letters Patent.

Patented Dec. 25, 1906.

Application filed December 20,1905. S6rial No-292,630-

To all whom it 1nd, concern:

Be it known that I, RUDOLF Mi'JLLER, Ph. D., chemist, a citizen of the Empire of Germany, residing at Hchst-on-the-Main, Germany, have invented certain new and useful Im rovements in the Manufacture of Hydrosul te Preparations, of which the following is a specification.

I have found that a stable hydrosulfite preparation may be obtained suitable for vat-dyeing by treating alkali hydrosulfites with ammonia and ketones, like dimethylketone and ethylmethylketone, and by evapcrating the mixture to dryness in a vacuum.

only slowly by the influence of the air.

The product obtained by thisprocess is no homogeneous compound and cannot be expressed by a formula. The product is char acterized by its decomposing into ammonia,

acetone, and hydrosuliite when heated solution. I c

Having now described my invention, what I claim is j 1. The process herein described for the manufacture of hydrosulfite which consists in bringing toget ier alkali hydrosulfites, ketones and ammonia and in drying the mixture in a vacuum at low temperature.

2. A new hydrosulfite obtained by evaporating a solution of alkali hydrosulfite in the presence of dimethylketone and ammonia,

being a white powder readil soluble in water, the solution of which, w en heated, has the odor of acetone and ammonia and which reduces indigo 'sulfonic acid at ordinary temperature. I

In testimony that 61am theforegoing as my invention I have signed my name in pres' ence oftwo'subscribin witnesses. I y 1 RI DOLF vIVIULLER.

Witnesses:

' JEAN CARL GRUND; GRUND.

reparations, 

